<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Symbol内置属性</title>
</head>
<body>
    <script>
        // class Person{
        //     static [Symbol.hasInstance](param){
        //         console.log(param);
        //         console.log("我被用来检测类型了");
        //         return false;
        //     }
        // }

        // let o = {};

        // console.log(o instanceof Person);

        // const arr = [1,2,3];
        // const arr2 = [4,5,6];
        // arr2[Symbol.isConcatSpreadable] = false;
        // console.log(arr.concat(arr2));
    </script>
</body>
</html>